The Wildest Moments singer took to to share the happy news, posting a photo of herself wearing a tight black dress while standing in a side profile - a pose that highlighted her growing baby bump.

Jessie added in the caption to the image, "Dropping this year, and it's not the album."

The 31 year old later shared a snap of an indulgent milkshake, topped with a cookie and toasted marshmallow, writing, "Pregnancy diet going really well so far."

The star wed her childhood sweetheart Sam Burrows in August, 2014 during a romantic ceremony on the Greek island of Skopelos, where the pair got engaged. The mum-to-be first met her husband at school before reconnecting as teenagers. Their wedding invitation featured a picture of them taken in 1996, when they were aged 11.